37 PowerEdge R620 Technical GuideTable 23 details the acoustical performance for the R620.Table 23. Acoustical performanceConfiguration(23 ± 2°Cambient)CPUs HarddrivesPowersupplyunitMemoryPCIcard/HDDcontrollerOperatingmodeLWA-UL1(bels)LpA2(dBA)Prominenttones3Minimum 11 x250GBSATA(7.2K)1 x495W1 x 2GB1333Hz1 x PERCH310Idle4 3.9 24 NoneStress5 3.9 24 NoneTypical 24 x300GB SAS(10K)2 x750W8 x 8GB1600Hz1 x PERCH7101 x Gb NICIdle4 4.4 31 NoneStress5 5.1 39 None1LWA-UL is the upper limit sound power levels (LWA) calculated per section 4.4.1 of ISO 9296 (1988) and measured inaccordance to ISO 7779 (2010).2LpA is the average A-weighted sound pressure level from the four bystander positions calculated per section 4.3 ofISO9296 (1988) and measured in accordance with ISO 7779 (2010). The system is placed in a half rack enclosure (base ofsystem is 25 cm above reflective floor).3Prominent tone: Criteria of D.6 and D.11 of ECMA-74 11th ed. (2010) are followed to determine if discrete tones areprominent. The system is placed in a half rack enclosure (base of system is 75 cm above reflective floor) and acoustictransducer is at front bystander position, ref ISO 7779 (2010 Section 8.6.2).4Idle: Reference ISO 7779 (2010) definition 3.1.7; system is running in its operating system but no other specific activity.5Stressed processor: An operating mode per ISO 7779 (2010) definition 3.1.6. The software SPECPower at 50% loading isactivated to stress the processors.For more information on Dell’s acoustical design, see the Dell Enterprise Acoustics white paper.